Display member alignment in ComboBox

Display text in ComboBox is a concatenated string from database table. The concatenated string (e.g. column1 (char(50)) + ' ' + column2) looks fine in SQL client. However it is messed up in ComboBox. Obviously
it's caused by different Character width. Is there any way to make those aligned nicely? Thanks very much for help.

I see that you posted a picture on the Issue Tracker (http://wpf.codeplex.com/WorkItem/View.aspx?WorkItemId=10245). Thanks for sending that. We took a look at this, but
it's hard to tell what's going on without seeing your code - is there any way you could also attach a repro project to the Issue Tracker? Is this happening within a DataGrid or is just in a standalone ComboBox? How are you binding your ComboBox
to the data?